User manual

Backing up Files Again - Updating a File Backup
An examp
le is provided below to illustrate the difference between incremental and differential
You

e Incremental backup, 25 photos are backed up, specifically those that
he

ifferential backup, 50 photos are backed up, specifically those that
ally more
and the last) are needed. Consequently, for the restore only
two versions are restored (and made ready) because the last version contains all changes
made since the first ba
backups:
Let's assume that you have 100 photos and are backing them up. The first (full) backup
contains the 100 photos. Then you change 25 of the photos and want to back up again.
select an incremental or differential backup (it does not matter which you select for the
second backup). The 25 changed p
hotos are backed up. Then you change another 25
photos and want to back up again:
If you select th
have changed since the last backup. (Nero BackItUp compares the current status with t
last backup.)
If you select the D
have changed since the first backup. (Nero BackItUp compares the current status with
the first backup.)
This means that incremental backups require less storage space, however usu
backup versions will have been created. The result is that the restore takes longer since
many small versions must be restored (and made ready) one after the other.
The opposite is true of the differential backup: It requires more storage space, however only
two backup versions (the first
ckup.
1st backup
2nd backup
3rd backup
Fig. 7: Data backup distinction between differential and incremental backup
Nero BackItUp 20
Data on the computer Incremental
backup
Differential
backup